In which of the following ways does a chemical buffer system normalize a pH of 7.30
Releases hydrogen ions
Blinds hydrogen ions
Creates additional hydrogen ions
Destroys excess hydrogen ions
The Correct Answer is B
a. Releases hydrogen ions: Releasing hydrogen ions (H⁺) into the solution would lower the pH, making the solution more acidic. This is not the correct way to normalize a slightly acidic pH of 7.30.
b. Blinds hydrogen ions: This is likely a typographical error, and it should be "binds hydrogen ions." Binding hydrogen ions (H⁺) would reduce the concentration of free hydrogen ions in the solution, thereby raising the pH and making the solution less acidic. This is the correct mechanism to normalize the pH of 7.30 to a more neutral level.
c. Creates additional hydrogen ions: Creating additional hydrogen ions would further lower the pH, making the solution more acidic. This is not how a buffer system would normalize a slightly acidic pH.
d. Destroys excess hydrogen ions: While this option might seem correct, it is not typically how chemical buffer systems operate. Buffer systems usually bind (or release) hydrogen ions rather than destroy them.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
a. Splenic flexure: This is the bend between the transverse and descending colon on the left side, also known as the left colic flexure.
b. Right colic flexure: The hepatic flexure, also known as the right colic flexure, is the bend between the ascending and transverse colon near the liver.
c. Pontine flexure: This refers to a bend in the developing brainstem, not the colon.
d. Left colic flexure: This is another name for the splenic flexure, not the hepatic flexure.
Correct Answer is A
Explanation
a. Pyloric sphincter: This sphincter regulates the passage of chyme from the stomach into the duodenum.
b. Lower esophageal sphincter: This sphincter prevents the backflow of stomach contents into the esophagus.
c. Ileocecal sphincter: This controls the flow of material from the ileum of the small intestine into the cecum of the large intestine.
d. Internal anal sphincter: This sphincter controls the release of feces from the rectum but is not involved in the release of chyme
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